diff --git a/lib/api/trading.js b/lib/api/trading.js
index 3689ef9..730eace 100644
--- a/lib/api/trading.js
+++ b/lib/api/trading.js
@@ -445,7 +445,7 @@ TradingWrapper.prototype.withdraw = function(currency, amount, address, paymentI
     // Deal with optional nature of paymentId
     if (typeof paymentId === "function") {
         callback = paymentId;
-        paymentId = null
+        paymentId = null;
     }
 
     // Build query options